The invention relates to a protective hood with a housing (1) for the protection of a measuring apparatus (2), which housing comprises a receiving space (17) for receiving a first measuring apparatus section (20) of such a measuring apparatus (2) and a through opening (12) for running a second measuring apparatus section (21) through it. The arrangement is advantageous in that at least one underlapping support element (18, 19) extends into the receiving space (17) for partially underlapping the first measuring apparatus section (20) in the direction of the through opening (12), and that the housing (1) is constructed from at least a first and a second housing section (1a, 1b) and at least one coupling element (13; 14, 15), and that the first measuring apparatus section (20) can be set between the housing sections (1a, 1b) and that the latter can be subsequently designed to be adjustable to one another for forming and closing the receiving space (17). At least one such coupling element is preferably constructed as an articulation (13) connecting housing sections (1a, 1b) to one another. Moreover, a process for mounting such a protective hood is advantageous.